exim reject all local_part matching a pattern

Question

I am trying to configure Exim to reject any $local_part that match a pattern.

For example, I know that none of the local_parts for any of the myriad of domains I host will ever contains numbers. So, I know if someone send an email to [email protected], I know it is spam and can safely reject it.

What would be the best ACL for this?

Answer 1

ACL line could be the next:

deny condition = ${lookup{$localpart}nwildlsearch{/path/to/the/black.list}{yes}{no}}

While black.list contains PCRE regexes one per line like that:

^.*[0-9].*
^.*[!@#$%^&*()_+].*
^.*sales.*

Answer 2

Based off Kondybas's answer, an Ubuntu/Debian specific answer is to change the follow lines in /etc/exim4/conf.d/main/01_exim4-config_listmacrosdefs to read:

.ifndef CHECK_RCPT_LOCAL_LOCALPARTS                                             
CHECK_RCPT_LOCAL_LOCALPARTS = ^[.] : ^.*[@%!/|`#&?0-9]                          
.endif

Clearly this only works for adding [0-9] to the pattern. Other patterns might require Kondybas's solution.